Cherokee 4.0L

An electric radiator cooling fan is used on models with A/C or heavy duty cooling. Normal operation of the radiator cooling fan is controlled by the PCM through the coolant sensor input. Cooling fan will also operate whenever A/C compressor clutch is activated, regardless of temperature.

When engine coolant temperature reaches 217°F (103°C), PCM supplies radiator cooling fan relay with a ground path. Radiator cooling fan relay contacts close and allows battery voltage from the ignition switch to reach radiator cooling fan motor. When coolant temperature drops to 208°F (98°C), PCM will remove radiator cooling fan relay ground path.